{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T22:25:43Z","timestamp":1789683943390,"version":"4.0.1"},"reference-count":67,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,3,4]],"date-time":"2026-03-04T00:00:00Z","timestamp":1772582400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Immunol."],"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>The relevance of age-related immunological alterations in patients experiencing fractures has drastically increased due to the global rise in life expectancy and the elevated risk of fractures among elderly individuals. The potential cross talk between long-bone fractures and the respiratory system is particularly crucial, given the high incidence of healthcare-associated pneumonia and its impact on mortality in aged patients with fractures.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Method<\/jats:title>\n                    <jats:p>Age-dependent differences in lung inflammation and regeneration following fracture were investigated using male C57BL\/6J mice aged 17\u201326 weeks (young) and 64\u201372 weeks (aged), which underwent a unilateral femur osteotomy with external fixation (Fx) or sham surgery.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Fracture leads to an altered inflammatory response and expression of regeneration-associated pathways in the lung of both young and aged mice, as reflected by reduced levels of pro- and anti-inflammatory cytokines IL-6, MCP-1, and IL-10, along with increased gene expression of sclerostin, a regulator of Wnt signaling. In addition, aged mice showed increased CXCL1 levels, resulting in enhanced pulmonary neutrophil infiltration following fracture. This was associated with increased pulmonary damage, as evidenced by heightened RAGE and total protein BAL levels.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Our data suggests that femoral fracture in the elderly impairs lung inflammatory regulation and early regeneration, which potentially increase the risk of pulmonary complications.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fimmu.2026.1763857","type":"journal-article","created":{"date-parts":[[2026,3,4]],"date-time":"2026-03-04T05:43:14Z","timestamp":1772602994000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Femoral fracture leads to moderate pulmonary organ damage in aged mice and induces immune alterations"],"prefix":"10.3389","volume":"17","author":[{"given":"Jasmin 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